How to test a gateway / NAT for ports allowed

["Jago Pearce" <jago25_98 () hotmail com>]

... and ports blocked. It seems IRC ports may be blocked but I need to be 
sure. How can I use nmap to find what ISN'T blocked?

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Thank you for your time. (Please Type "REPLY:" in subject field if you wish 
to highlight your response, thx).  jago25_98 () catholic org is just my email 
provider of choice, that's all; I agree with thier policies over email.

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